On Tue, 17 Oct 2017 11:22:19 +0200 David Hildenbrand <[email protected]> wrote:
> On 17.10.2017 10:47, Cornelia Huck wrote: > > On Mon, 16 Oct 2017 22:23:56 +0200 > > David Hildenbrand <[email protected]> wrote: > > > >> Details about Low-Address Protection can be found in description of > >> patch 1 and 2. It is basically a subpage protection of the first two > >> pages of every address space (for which it is enabled). > >> > >> We can achieve this by simply directly invalidating the TLB entry and > >> therefore forcing every write accesses onto these two pages into the slow > >> path. > >> > >> With this patch, I can boot Linux just fine (which uses LAP). This also > >> makes all related kvm-unit-tests that we have pass. > > > > Tested with a kernel based on the s390/features branch (4.14-rc2 + s390 > > patches) and the initrd from the debian installer, had udevd shot down > > by the oomkiller. That happened only once, so it was probably an > > unrelated fluke, but that combination worked well before. > > > > Very unlikely, on invalid programming exceptions you would get a kernel > panic, not run oom. (not saying it isn't possible, rather that it is > very unlikely). That's what I thought as well. > > Can you reproduce with more memory? Have you enabled SMP? (little higher > memory consumption) SMP is on. I could not reproduce it again... > > I am running (almost) the same setup with 500M and haven't observed any > such thing. ...so I think it really is an unrelated fluke (and I'll simply make the machine a bit larger).
